The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
For metro applications, direct detection offers the advantages of low cost and low complexity. Discrete multi-tone (DMT) is a promising format due to its high spectral efficiency, flexibility and tolerance to chromatic dispersion (CD). In this work, single-side-band-DMT (SSB-DMT) and tuneable electrical dispersion compensation double side-band-DMT (TEDC-DSB-DMT) are summarized and compared.
In contrast to the more prominent discrete-variable quantum key distribution (DV-QKD), which requires specialized hardware like single-photon detectors, the continuous-variable version (CV-QKD) promises low-cost and high-performance implementations by leveraging mature telecommunication technology. In this paper we demonstrate a simplified CV-QKD architecture based on analog frontends and digitizers...
On-off keying (OOK) signals up to 190 Gb/s are generated in a bandwidth limited system using a 92 GSa/s DAC and a simple coding and cutting technique. The coding method is cascaded duo-binary coding, and the performance at different baud-rates is investigated.
A low-complexity BICM-ID structure which embeds demappers inside the iterative FEC decoder is proposed and demonstrated. 0.47-dB SNR gain over BICM can be obtained for the 8-dimentional modulation format with 8.5-miUion extra ASIC gates at 100-Gb/s throughput.
A 90 GBaud single sideband duobinary PAM-4 signal is generated using bandwidth pre-compensation and duo-binary pulse shaping employing a 92 GSa/s DAC. Transmission over 13 km of SSMF is achieved in 50 GHz channel enabled by dispersion pre-compensation at the transmitter.
A novel SCI-BCH code and an error pattern breaking decoding algorithm are proposed. Compared with the CI-BCH code, the error floor is lowered from BER of 1e-9 to 1e-16 at small latency and storage cost.
We experimentally investigate the impact of different transmitter's pre-distortion techniques for 28 Gb/s/λ IM/DD transmissions over 80 km in DCF-free band-limited systems. OSNR requirements of the proposed scheme are presented as well.
We investigate timing recovery schemes for 28 Gb/s NRZ-OOK systems employing inexpensive 1550 nm 7-GHz TOSA and ROSA devices in DCF-free links up to 100 km and propose a low-complexity algorithm enabling reliable clock extraction.
We experimentally demonstrate 56-Gbps optical interconnection over 1 km SSMF by using 10G 1550nm VCSEL. PAM4 and Poly-PAM4 MLSE algorithms are developed to optimize the system performance and overcome the chirp-chromatic-dispersion induced power degradation after 1 km fiber transmission.
We propose and experimentally demonstrate the use of dynamic decoding and limiting to achieve high-performance cycle-slip-tolerant turbo differential decoding in soft-decision LDPC, reducing the differential decoding penalty by 2 dB even in the presence of 10−2 probability of cycle slips.
Single wavelength 56Gbps transmission in 640km dispersion-unmanaged link is successfully realized by using direct-detection discrete multi-tone (DMT) modulation method. A single polarization IQ modulator is used to do chromatic dispersion pre-compensation and generate single sideband (SSB) DMT signal. Just one PIN is used to detect the received signal to reduce the cost. More than 3000ps/nm chromatic...
We demonstrate the transmission of 28 Gb/s NRZ-OOK over DCF-free links up to 10 km using a monolithic VCSEL, direct detection and an MLSE-based receiver for low-cost, short-reach interconnects. DSP complexity is also investigated in terms of performance optimization.
A novel coded modulation scheme which adaptively supports multiple modulation formats for software defined networks is proposed. With the same fundamental FEC architecture, alterable bitrates can be compatibly implemented without additional hardware recourses and performance penalty.
We present a novel timing recovery architecture for Nyquist systems having their performance independent of the Nyquist filter and modulation formats. Excellent performance is demonstrated even in extremely bandlimited systems, called faster than Nyquist systems.
We discuss implementation aspects of LDPC based soft-decision FEC schemes for high speed optical systems. Several BICM schemes with LDPC convolutional codes are proposed and compared in respects of both performance and implementation complexity.
We present a novel timing recovery scheme based on a Gardner phase detector performing excellently in spectrally efficient Nyquist coherent optical systems. Good clock tone performance is obtained for QAM modulation formats and roll-off factor (ROF) values close to 0.
We propose a hybrid soft/hard decision multilevel coded modulation scheme (HMLC) which improves the performance-complexity ratio compared with conventional single LDPC scheme. An iterative multi-stage decoding algorithm between LDPC and BCH codes is presented.
We present performance improvements in nonlinear regime of long-haul transmission systems. In several transmission scenarios based on offline data MLSE, simplified BP, modified NPCC, carrier recovery optimization and combinations thereof show improvement up to 1.8dB.
We evaluate the performance of nonredundant differential decoding schemes under linear and nonlinear channel conditions with various neighbor channels based on measured data. Each method is analyzed with respect to its systematic back-to-back performance, its nonlinear tolerance, its implementation complexity, and its compatibility to soft-decision (SD) forward error correction (FEC). All schemes...
Deviations away from ideal AWGN statistics degrading FEC performance are demonstrated caused by the nonlinear optical channel and by receiver-side DSP. An according noise model is demonstrated for FEC test and optimization.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.